P20FAReductant Pump B Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P20FA means the controller has found an open or otherwise faulty drive circuit for the second reductant (DEF/AdBlue) pump, called pump B or pump 2. No public service text explains which physical pump carries this letter; it is a driver channel of its own, separate from pump A (P208A). Ford stores P20FA together with P20FC and P20FD on 2023–2024 Super Duty and F-650/F-750 trucks with the 6.7L diesel (SSM 51891 and 52299, MIL lit) and asks technicians to check two connectors for seating and three more for water ingress and corrosion before normal diagnosis. FCA lists it as Reductant Pump 2 Control Circuit/Open for 3.0L EcoDiesel models and counts it among the faults that start the Service DEF countdown. With the pump unpowered, dosing stalls and NOx output climbs.
- What you may notice
- Malfunction indicator lamp on
- Service DEF or AdBlue warning with countdown to restart lockout
- Other SCR codes stored at the same time (P208A, P20FC, P20FD)
- Likely causes
- LikelyWater ingress or corrosion in the pump B connectors or harness
- PossibleConnector not fully latched after assembly or repair
- PossibleOpen winding or internal break in pump B
- RareFaulty output stage in the engine or DEF control module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.